초록 ▼

A drive motor has a shaft supported by a casing to be rotatable and movable in the axial direction over a predetermined stroke. A portion of the shaft is utilized in order to form a rotary motor section for rotating the shaft, and another portion of the shaft is utilized in order to form an electrom

A drive motor has a shaft supported by a casing to be rotatable and movable in the axial direction over a predetermined stroke. A portion of the shaft is utilized in order to form a rotary motor section for rotating the shaft, and another portion of the shaft is utilized in order to form an electromagnetic plunger section for moving the shaft in the axial direction. The rotary motor section and the electromagnetic plunger section are integrally built in the casing. The drive motor is used in a drive apparatus for a pre-plasticization-type injection molding machine. The front end of the shaft is connected to the rear end of a screw disposed within a barrel of a plasticizing unit of molding machine. Through axial movement of the shaft, a resin passage of the barrel is opened and closed by a valve portion provided at the front end of the screw.

대표청구항 ▼

1. A drive motor comprising:a casing; a shaft supported centrally by said casing to be rotatable and movable in an axial direction over a predetermined stroke; a rotary motor section formed through utilization of a portion of said shaft and adapted to rotate said shaft; a support mechanism supported

1. A drive motor comprising:a casing; a shaft supported centrally by said casing to be rotatable and movable in an axial direction over a predetermined stroke; a rotary motor section formed through utilization of a portion of said shaft and adapted to rotate said shaft; a support mechanism supported by said casing to be movable in the axial direction and adapted to rotatably support said shaft, wherein said support mechanism includes a front support and a rear support, said rear support engaged with said casing and including a sub shaft and at least one rear bearing; and an electromagnetic plunger section formed through utilization of another portion of said shaft and adapted to move said shaft in the axial direction, wherein said electromagnetic plunger section comprises at least one magnetic attraction plate fixed to said shaft and at least one electromagnetic plate fixed to said casing such that each electromagnetic plate faces each magnetic attraction plate in order to attract said magnetic attraction plate, said rotary motor section and said electromagnetic plunger section are integrally built in said casing, and a base plate fixed to said casing, a plurality of core portions projecting from said base plate toward said magnetic attraction plate, and coils wound around said core portions.